NB_FSCALES         41 libavfilter/avf_showfreqs.c enum FrequencyScale { FS_LINEAR, FS_LOG, FS_RLOG, NB_FSCALES };
NB_FSCALES         48 libavfilter/avf_showspectrum.c enum FrequencyScale { F_LINEAR, F_LOG, NB_FSCALES };